Collectibles from the original Star Wars trilogy can fetch a lot of money at auction, but they typically take the form of well-known items such as original toys (in mint condition), costumes from the movies, or even props from the sets. However, there’s a few more obscure Star Wars items that are still worth a lot of money, some of which you may never of heard of before.

Take the 1978 promotional poster you see above that depicts C-3PO and R2-D2 carrying a number of musical instruments. They both look quite ridiculous, and yet this poster is expected to fetch between $5,000 and $8,000 at auction. I’m guessing that’s a conservative estimate, though.

The poster was created to promote The Star Wars Symphonic Suite by composer John Williams. The reason it is worth so much comes down to two factors. The first is the fact this is such a rare poster, and I must admit this is the first time I have ever seen it. The second value-boosting feature of this sheet of paper is the signature it carries, which belongs to George Lucas.

The poster was designed by John Alvin, who is well known for creating some of the most memorable movie posters ever made (Blade Runner, The Lion King, E.T., and Gremlins are just a few examples). This poster never actually got used though, either during Star Wars events or offered for sale to the public, hence it being so rare.